Page 182 - Industrial Power Engineering and Applications Handbook

W162 Industrial Power Engineering and Applications Handbook
Kb = factor of braking, which depends upon the type For most applications (e.g. cranes, lifts or machine
of braking used, such as tools) this factor is based on a loading of 0.5 or
(a) Mechanical braking Kb = 1 0.75. This factor is also determined by the
(b) D.C. braking Kb = 0.6-0.5 manufacturer and may have a shape as shown in
(c) Plugging Kb = 0.3-0.4 Figure 6.66:
(d) Regenerative braking Kb = 0.4-0.5
KL= mean load factor, i.e. the ratio of the average
load torque to the motor torque which depends FI = GD& + GD:
upon the loading on the motor during start-up. GD&

Relevan. Standards

IEC Tftle IS BS
60034- 111 996 Rotating electrical machines 4722i1992 BSEN 60034-
Rating and performance 325/1996 111995
60034-17/1998 Cage Induction motors when fed from converters
Application guide
60146-1-1/1991 Specifications of basic requirements for power 14256/1995 BSEN 60146-1-
converters /1993
60439- 1/1992 Low voltage switchgear and controlgear assemblies. 8623 (Part-I) 1993 BS EN : 60439
Type tested and partially type tested assemblies 10994
Code of practice for selection, installation and 10118 (Part-HI) 1982 -
maintenance of switchgear and controlgear: Part 3
Installation
Related US Standards. ANSVNElMA and IEEE
ANSMEEE-C62.4 1- 1991 Recommended practice for surge voltages in low voltage a.c. power circuits
ANSYIEEE Standard for control switchboards
C-37.21/1998
ANSMEEE-5 19/1993 Guide for harmonic control and reactive compensation of static power converters
NEMAIMG-7/1993 Motion/position control motors and cables
NEMMCS-1.111988 Safety guidelines for the application, installation and maintenance of solid state control
NEMMCS-7/1993 Industrial control and systems. Adjustable speed drives
NEMMCS7. 111995 Safety standards for construction and guide for selection, installation and operation of adjustable speed
drive systems
NEMAIICS-9/1993 Industrial control and systems. Power circuit accessories (requirement for brakes)
NEWS- 1/1992 Low voltage surge protection devices

Notes
1 In the tables of relevant Standards in this book while the latest editions of the standards are provided, it is possible that revised editions
have become available. With the advances of technology and/or its application, the updating of standards is a continuous process by
different standards organizations. It is therefore advisable that for more authentic references, readers should consult the relevant
organizations for the latest version of a standard.
2 Some of the BS or IS standards mentioned against IEC may not be identical.
3 The year noted against each standard may also refer to the year of its last amendment and not necessarily the year of publication.